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/*
* Copyright 2011 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SFNTLY_CPP_SRC_SFNTLY_DATA_FONT_DATA_H_
#define SFNTLY_CPP_SRC_SFNTLY_DATA_FONT_DATA_H_
#include <limits.h>
#include "sfntly/data/byte_array.h"
#include "sfntly/port/refcount.h"
#include "sfntly/port/type.h"
namespace sfntly {
struct DataSize {
enum {
kBYTE = 1,
kCHAR = 1,
kUSHORT = 2,
kSHORT = 2,
kUINT24 = 3,
kULONG = 4,
kLONG = 4,
kFixed = 4,
kFUNIT = 4,
kFWORD = 2,
kUFWORD = 2,
kF2DOT14 = 2,
kLONGDATETIME = 8,
kTag = 4,
kGlyphID = 2,
kOffset = 2
};
};
class FontData : virtual public RefCount {
public:
// Gets the maximum size of the FontData. This is the maximum number of bytes
// that the font data can hold and all of it may not be filled with data or
// even fully allocated yet.
// @return the maximum size of this font data
virtual int32_t Size() const;
// Sets limits on the size of the FontData. The FontData is then only
// visible within the bounds set.
// @param offset the start of the new bounds
// @param length the number of bytes in the bounded array
virtual void Bound(int32_t offset, int32_t length);
// Makes a slice of this FontData. The returned slice will share the data with
// the original <code>FontData</code>.
// @param offset the start of the slice
// @param length the number of bytes in the slice
// @return a slice of the original FontData
virtual CALLER_ATTACH FontData* Slice(int32_t offset, int32_t length) = 0;
// Makes a bottom bound only slice of this array. The returned slice will
// share the data with the original <code>FontData</code>.
// @param offset the start of the slice
// @return a slice of the original FontData
virtual CALLER_ATTACH FontData* Slice(int32_t offset) = 0;
// Gets the length of the data.
virtual int32_t Length() const;
protected:
// Constructor.
// @param ba the byte array to use for the backing data
explicit FontData(ByteArray* ba);
// Constructor.
// @param data the data to wrap
// @param offset the offset to start the wrap from
// @param length the length of the data wrapped
FontData(FontData* data, int32_t offset, int32_t length);
// Constructor.
// @param data the data to wrap
// @param offset the offset to start the wrap from
FontData(FontData* data, int32_t offset);
virtual ~FontData();
void Init(ByteArray* ba);
// Gets the offset in the underlying data taking into account any bounds on
// the data.
// @param offset the offset to get the bound compensated offset for
// @return the bound compensated offset
int32_t BoundOffset(int32_t offset);
// Gets the length in the underlying data taking into account any bounds on
// the data.
// @param offset the offset that the length is being used at
// @param length the length to get the bound compensated length for
// @return the bound compensated length
int32_t BoundLength(int32_t offset, int32_t length);
static const int32_t GROWABLE_SIZE = INT_MAX;
// TODO(arthurhsu): style guide violation: refactor this protected member
ByteArrayPtr array_;
private:
int32_t bound_offset_;
int32_t bound_length_;
};
typedef Ptr<FontData> FontDataPtr;
} // namespace sfntly
#endif // SFNTLY_CPP_SRC_SFNTLY_DATA_FONT_DATA_H_
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